<template>
    <h4>当前的求和为：{{sum}}</h4>
    <button @click="sum++">点我++</button>
    <hr/>
    <h2>姓名：{{name}}</h2>
    <h2>年龄：{{age}}</h2>
    <h2>薪资：{{job.j1.salary}}K</h2>
    <button @click="name+='~'">修改姓名</button>
    <button @click="age++">增长年龄</button>
    <button @click="job.j1.salary++">涨薪</button> 
  </template>
  
  <script>
    import {reactive, readonly, shallowReadonly, ref, toRefs} from 'vue'
    export default {
      name: 'Demo',
      setup(){
        // 数据
        let sum = ref(0)
        let person = reactive({
            name:'张三',
            age:18,
            job:{
                j1:{
                    salary:30
                }
            }
        })

        // person = readonly(person)
        // person = shallowReadonly(person)
        // sum = readonly(sum)
        // sum = shallowReadonly(sum)

        // 返回一个对象（常用）
        return {
          sum,
          ...toRefs(person)
        }
      }
    }
  </script>
  
  